Discharge-tube.



E. REISZ.

DISCHARGE TUBE.

APPLICATLON FILED'OCT. 10. 1913.

Patented June 8, 1915.

EUG N 52, QB E 'J-B E 'IQ GERMAN DISCHARGE-TUBE.

peci a io ette s retini- Patented June 8, 191-5.

Application filed October 10, 1018. Serial No. 94,467.

To all whom it may concern:

Be it known that I, EUGEN REIsz, SllbJGOt of the Emperor of Austria-Hungary, residing at Berlin-Treptow, Germany, have invented certain new and useful ,Improvements in Discharge-Tubes, of which the following is a specification.

This invention relates to discharge tubes having an incandescent metal oxid cathode and more especially to such tubes which contain vapors liable to condense. Such discharge tubes, as is well known, are used mainly for relay purposes, in'which uniform and economical working of the tube 1s essential. Such uniform and economical working of the discharge tube can, however, only take place if a uniform heating of the glass walls by the discharge current is effected. This is of great importance as the pressure of the vapors in such a tube is higher than the saturation pressure corresponding to the temperature at the outside,

and therefore there' is afliability of the vapors to condense on cooler surfaces. Such surfaces, at which condensation is likely to take place are mainly caused to form near the place at which the. feed wires are fused in; the glass, a thickening of the glass at these places being unavoidable. Such surfaces however are especially detrimental where a plurality of electrodes have to be used as the various places of fusion. for the feed wires then do not allow a uniform heating of the tubes.

Now it is an object of this invention to avoid the detrimental effects of sl'uchcondensation surfaces by introducing the various feed Wires for the electrodes at a single "fusion place which is located immediately adjacent the incandescent cathode. By these means only a single surface is formed at which condensation of the vapors is likely to; take place and furthermore this condensation is prevented by the arrangement of this place near the incandescent cathode, whereby a heating of the surface is obtained by radiation. Another advantage resulting from this arrangement lies in the fact that the tube may then be shaped as a simple body of revolution throughout, which greatly simplifies the manufacture and the mounting of .such tubes.

In the accompanying drawing a discharge tube having four feed wires is represented as an example. It will be seen that the anode d, an auxiliary electrode 71. and the cathode is are all fixed on an upright or support 8; the feed wires 2 2 e 2 being four in number are introduced through the lower tube like end of the support and are insulated from each other either by some suitable intermediate layer or by suitable selection of their relative positions. The support 8 is fused to the body of the tube at the annular juncture n. The feed wires are furthermore connected to the four contact pieces a, 0 d, 03 respectively, which are arranged on a common insulating blocki fastened to the tube by a metal ring, so as to form one integral piece with said tube. The contacts may be plugs and bushings for receiving plugs so arranged that no mistake with regard to the electrodes is possible. It will be seen from the drawing that the construction described enables the tube to have a uniform thickness throughout, no places at which a thickening of the walls is necessary occurring with exception of the place at which the bulb f for storing the the whole tube by the discharge current can therefore take place.

I claim as my inventionl. ,A. discharge tube comprising an anode, an incandescent metallic oxid cathode, supply wires for the same, a vapor developing substance stored in a bulb of the tube and a support arranged in the middle axis of the tube containing all the supply wires and fused into the tube at a place near the metallic oxid cathode.

2. A discharge tube comprising an anode, an incandescent metallic oxid cathode, supply wires for the same, an auxiliary electrode between the cathode and the anode, holding means and a supply wire for said auxiliary electrode, a vapordeveloping substance stored in a bulb of the tube and a sup port arranged in the middle axis of the tube containing all the supply wires and carrying holding means for the auxiliary electrode, said support being fused into the tube at a place near the metallic oxid cathode.

- betweenthe cathode and the anode, holding means and a supply wire for said auxiliary electrode, a vapor developing substance stored in a bulb of the tube, av support arthe holding means for the euxi1iary electrooie, said support being fused into the'tube at a place near the-metallic oxid cathode,

an insulating block in fixed connection With the tube, and contact pieces in connection with the supply wires, arranged on said block aoiaptedl to distinguish the supply wires from each other.

In testimony whereof I havehereunto set my hand in presence of one subscribing Witness. I

EUGEN REISZ.

Witness RICHARD Goon. 

